Flask



.F. EVROACH.

FLASK.l APPLICATION FILED MAY zo, 1920.

1 ,434,408. Patented Nov. 7, 1922.

Patented Nov. 7, 1922.

NlTED STATES FINIS E. ROACH, 0F CHICAGO, ILLINOIS.

FLASH.

Application filed May 20,

To all whom 'it may concern.'

Be it known that I, Finis E. RoAoH, a citizen of the United States, residing at Chicago, in the county of Cook and State of lllinois, have invented certain new and useful Improvements in Flasks, of which the following is a specification, reference being had to the accompanying drawings, and to the reference characters marked thereon, which form a part of this specification.

This invention relates to improvements in flasks more particularly designed for use in dental centrifugal casting machines, and consisting in the parts and combination of parts illustrated and hereinafter described and claimed.

ln casting machines, it is very desirable that the crucible and the ask should be capable of being placed in such position in the machine so that the opening from the crucible to the opening in the investing material placed in the flask and containing the mold proper, shall be closely associated in order that the molten gold shall flow with great Vrapidity and directly from the Crucible into the mold without spattering, and consequent loss.

It has heretofore been the practice to make the opening in the investing material in the flask somewhat larger than the exit opening from the crucible, but this is highly objectionable in practice. One of the objects of my invention, therefore, contemplates such an arrangement of flask construction as will form in the investing material an inlet opening that will register ac curately with the exit opening from the crucible and particularly that the lower portion of said opening shall register in a substantially straight plane with the bottom of that part of the Crucible containing the molten metal.

Another object of my invention is to provide a liask construction with an open top whereby the investing stepI in the casting operation may be conveniently and readily accomplished; and having a closure adapted to cover the open top of the flask when a removable end member is removed, so that the flask proper and its contents may be conveniently handled without injury to the mold.

These and other objects of the invention will be more fully comprehended as I pro @eed with this specification.

1920. Serial No. 382,938.

ln the drawings:

Fig. l is a perspective view of a flask body with the hinged closure member raised, p onstructed in accordance with my invenion.

Fig. 2 is an elevation of the back end of the flask body with the lid down, partly in section.

F 1g. 3 is a perspective view of the removable front end member of the flask.

Fig. 4lis a central longitudinal vertical sectional view through the flask with the lid closed. the end member in position,the pattern suspended from the end member and the investing material in the flask body.

F 5 is a vertical sectional view on a smaller sca-le, of the ask without the front end member, and with the pattern removed,-the flask being in juxtaposition to the open end of a crucible.

The flask body is preferably of a generally rectangular shape and comprises two side walls l, 2, united by a bottom wall 3, and an end wall t. To the upper end and rear end of the side walls l, I secure a closure member or lid 5, by means of suitable pivots or rivets 6 passing through the downwardly projecting flanges 7. Near the front end of each of the side members l and 2, I provide a small knob or projection 8. Near the front end of the flanges 7, I provide a complemental recess 9 on the inside of the flange 7 as clearly shown in Fig. 2, the object being to frictionally and removably hold the cover or lid 5. to the side walls, after packing` the flask body with the investing material, so that the flask as a whole may be the more readily handled without injury to its contents.

The front margins of the walls l and 2 and the bottom 3 are in substantially the same plane, so that the inside face l0 of a removable end member l1 will lit nicely against said margins. This end member l1 is provided with a plurality of clips or arms l2, preferably three in number, one onA the bottom and one on each side, adapted to engage the outer surfaces of the side walls l and 2 and the bottom wall 3, when the plate l1 is in position against the -end of the flask body. Centrally arranged and projecting inwardly from the surface l() is a suitable boss 13. In this linstance it is shown as pyramidal in contour. This boss is provided with an inwardly directed re cess 11 adapted to receive a suitable sprue 'former 15, preferably of wax, projecting from the pattern to be molded; The shape of' this recess 14 is indicated in the drawings as tubular, and but one` sprue former is shown. Manifestly the recess 1a may be of other contour and in the ease of smaller patterns a plurality may be cast simultaneously either by enlarging the recess or providing several recesses to receive y a plurality of sprue formers.l The pattern is usually made of wax or other suitable material that may be easily converted from a` semi-rigid, plastic state into a fluid condition, and is indi cated in Fig. l at 16.

The rear wall Llmay be provided with suitable means whereby that end of the flask may be attached to or fixed in a castingmachine, in this instance I have shown as one such means a recess 17. y

In using this flask, I first place the remov able front end member 11 in position as shown in Fig. 4c, the lid 5 beingraised so as to leave the top of the flask open. I then insert the sprue former 15 to which is attached the pattern 16, in the recess or opening 14 of the boss 13. rI`he pattern 16 is covered with suitable investingmaterial which for the purposes of this specification I will call the casting sand, and which is indicated at 18, taking care to pack it about the pattern in a familiar manner. Preferably the sand 18 does not extend to the top of the flask so as to leave a suitable air space 19. I then run a vent rod through the sand from the 'front tothe rear end of the pattern, in order to form an air passageway or vent 20. I then remove the front end memn ber 11, the boss readily slipping off1 from the projecting end of the sprue former 15. I then subject the flask and its contents to the action of heat, which melts and dissipates the wax of the pattern and of the sprue former. This will leave a mold or recess indicated at M in the sand 18, and an inwardly tapered recess 21 in the front endof the sand 18, which. recess 21 communicates with the mold M by a narrow passageway 22. Theflask and its contents is then moved into juxtaposition to that part of a casting machine carrying the crucible. I have shown such a crucible 23 in Fig. 5 in which crucible the bottom wall is indicated at 2a and the exitopening at 25, the frame' holding the Crucible and the forward end of the flask is indicated at 26.

It will be noted by reference to Fig. 5 that the opening 25 registers completely with the large end of the recess 21 in the sand. In this connection it will be unders stood that I make the boss 13 on the end member 11 of such size as to conform to the opening 25 ofthe particular Crucible -with which the flask is to be used. It will also be noted by reference to Fig. 5 that the bottom line 24 of the crucible receptacle in which the molten gold is carried, is at its forward end in substantial alignment with the lower or proximate wall 2T of the recess 21, whereby the metal from the Crucible to the mold M is very greatly facilitated. The air and gases in the mold M will of course be forced out of the mold through the air vent 2() in the casting operation.

Modifications of the structure will of course occur to the skilled mechanic and may be made without departing from the principle of my invention. I do not desire my invention to be limited to the specific corr struction shown here except as pointed out in the appended claims.

I claim as my invention:'

1. A flask for centrifuga-l casting machines comprising two side walls, rear end wall and a bottom, a top hingedly connected at one end to the side walls to close the top of the flask.

2.`A ask for centrifugal casting machines comprising two side walls, rear end wall and a bottom, a top hingedly connected at one end to the side walls to close the top of the flask, said top being provided with downwardly projecting marginal flanges adapted to embrace the outside surfaces of the side walls.

A flask for centrifugal castingl machines comprisingtwo side walls, rear end wall and a bottom, a top hingedly connected at one end to the side walls to close the top of the flask, said top being provided with downwardly projecting marginal flanges adapted to embrace the outside surfaces of the side walls and complemental means for frictionally holding said flanges to said side walls.

4. A flask for centrifugal casting machines, comprising two side walls, a rear end wall and a bottom, and an aperture in the rear wall adapted to be engaged by complemental means for supporting the rear end of the flask in a casting machine.

In testimony that I claim the foregoing as my invention I afliX my signature, in the presence of two witnesses, this 14th day of May, 1920. n

- FINIS E. ROACH.

Witnesses:

B. L. MACGREGOR, TAYLOR E. BROWN.

free flow of the molten lOO 

